Render > Create Lights

Creates a fluorescent tube-like light.

Linear lights are one-dimensional lines of light like fluorescent tubes. A linear light is initially two units long. Use Transform > Scale to re-size a linear light.

Linear light shadows are much more costly than point light shadows. The increase in cost is proportional to the complexity of the scene and the length of the linear light.

You can create a light using the Create light tools or using the Multi-lister. You can use the light options to set properties for any new light you create.

By default, lights are named sequentially as you create them: Light, Light#2, and so on. To avoid confusion, however, you should name all lights as you create them. If you let the system assign default names and later combine two or more files, all lights are renumbered to avoid duplicate names. It may then become difficult to distinguish lights by name.

Note

Light#1 is not used explicitly as a name; the first light with a given name is implicitly numbered 1.

To create a light using the Light tools

Select a tool from the Render > Create lights cascading menu, or click one of these icons on the Create shelf:

Note
If shelves are not visible choose Windows > Shelves.
Place the light by clicking in the modeling window, or by typing a set of coordinates in the prompt line.
A new light swatch appears in the Multi-lister, and a new light icon appears in the modeling window. Each type of light has a unique modeling window icon and Multi-lister swatch.

In addition, light manipulators are displayed in the modeling window.

(To display the manipulators for an existing light, select the Pick > Object tool, select the light, and select a Light tool.)

Most lights have one manipulator that controls the light’s position. Spot lights have two manipulators: one manipulator controls the light’s position, the other manipulator controls its direction (look-at point). Each manipulator consists of a square icon at its center, and three colored arrow icons radiating from the center in the X, Y, and Z directions.

By dragging a square icon you can move the light or the light’s look-at point across the view plane (in orthographic windows) or parallel to the ground plane (in perspective windows). By holding the (Windows) or (Mac) key while you drag a square icon you can snap the light to grid points.

By dragging an arrow icon you can move the light or the light’s look-at point in the X, Y, or Z direction.

To create a light using the Multi-lister

In the Multi-lister (Render > Multi-lister > Lights), select Edit > New Light. A new point light swatch appears in the Multi-lister, and a new point light icon appears in the modeling windows at 0,0,0. Double-clicking the icon opens up the Control Window that allows you to change the light type and other parameters.

To display the light options box

Do one of the following:
- Select Create lights from the Render menu, then click the box beside the name of a light type (for example, Render > Create lights > Linear ❒).
- Double click one of the light icons from the Create shelf.

Linear Light Options

The Linear Light Options can be opened using the Linear light tool.

Color

The color of the light. If you map a texture to this parameter, the light projects the texture. (The exact method of projection depends on the Light Type.) The default setting is white.

Intensity

The brightness of the light. If the light exerts a force, this value sets its strength. A light with an Intensity value of 0 produces no light. A light with negative Intensity value removes light from a scene in the area of the light’s influence. The slider range is 0 to 100. The default value is 1.

Tip

Use a negative Intensity value to reduce or remove hot-spots or glare.

Decay

Controls how quickly light intensity decreases with distance. The Decay setting has no effect at distances less than 1 unit. If Force is set (that is, not OFF) under Active Effects, the Decay value controls how quickly the force intensity decreases with distance.

The Decay parameter works differently for volume lights (see Decay). Valid settings are 0, 1, 2 or 3. The default setting is 1.

0	no decay; light reaches everything
1	light intensity decreases directly (linearly) with distance (slower than real world light)
2	light intensity decreases proportionally with the square of distance (the same as real world light)
3	light intensity decreases proportionally with the cube of distance (faster than real world light)

Exclusive

Makes the light only illuminate objects that are linked to that light. A light with Exclusive LinkOFF illuminates objects that have no light links. The default setting is OFF.

Shadows

Determines whether the light casts shadows or not. The default setting is OFF. Please note that only spotlights can cast shadows in a raycast image.